名词
中文翻译：Unknown
同义词：
['extra weight', 'additional load', 'additional burden']
例句：
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1. The extra weight of the luggage made it difficult for us to move around.
行李的额外重量使我们难以移动。
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2. The company decided to add an additional load to their fleet.
公司决定给他们的车队增加一个额外的负载。
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3. The extra weight of the snow caused the roof to sag.
雪的额外重量使屋顶下垂。